5.13 I can describe catalytic cracking of long-chain hydrocarbons

2004_cracking_liquid_paraffin.mpg

1. Why should you take the end of the delivery tube out of water before you stop heating?
To prevent 'suck back' which can cause rapid change in volume and break the testube (explosion)
2. Name the catalyst for cracking paraffin.
Aluminium Oxide
3. What method is used to collect the gas? Describe the reason why/process.

Over water. The gas doesn't dissolve in water, therefore it is the most suitable way to collect the gas.

4.  What is the process to distill the crude oil?
Cracking
5. Catalysts are used in this experiment. What is the purpose of it?
To speed up the experiment
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